Abrading-machine



3 Sheets-Sheet 1.

(No Model) 'F. W. OOY.

ABRADING MAGHINE. I No. 296,535. Patented-Apr. ,8, 1884.

W667 Jaws 31/067660? (NoMocleL) 3 Sheets Sheet 2.

- F. W. OOY.

ABRADING MAOHINE. N0.-296,535. Patented Apr. 8, 1884.

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3 Sheet Sheet 3.

(No Model.)

1*. W. GOY. ABRADING MACHINE.

N0. 296,535. Patented Apr. 8, 1884.

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Lupe/10307 n. o. c.

NI'TED STATES PATENT rrrcn.

ABRADING- .MACHINE.

SPECIFICATION forming part of Letters Patent No. 296,535, dated April 8, 1884.

To aZZ whom it may concern.-

Be it known that I, Fnnnnmon W. (JOY, of Boston, in the county of Suffolk and State of Massachusetts, have invented certain Improvements in Abrading-lllachincs, of whibh the following is a specification.

This invention relates to abrading-machines having an endless belt with an abrasive surface mounted on two supporting-pulleys, and an intermediate support arranged to bear against the back of said belt at a point between the supporting-pulleys, and support the belt against pressure exerted on the latter by the article presented to the belt for its smooth ing action, as shown in Letters Patent of the United States No. 294,766, March 11, 1884.

My present invention has for its object, first, to enable the belt to be tightened by pressure against its intermediate support, and to be automatically loosened when such pressure is removed, so that the belt will be under tension only when in actual use, and unnecessary strain thereon will be avoided.

The invention also has for its object to pro vide an intermediate support of improved form, whereby the belt is adapted to act on variously-formed surfaces.

The invention also has for its obj eot to provide certain minor improvements, all of which I will now proceed to describe and claim.

Of the accompanying drawings, forming a part of this specification, Figure 1 represents a side elevation of an abrading-machine embodying my invention. Fig. 2 represents a top view of the same. Fig. 3 represents a longitudinal vertical section on line a: .r, Fig. 2-. Fig. 3 represents a modification. Figs. 4, 5, 6, and 7 represent, respectively, sections on 'lines 1:; z, z z", and 2 e Fig. 3. Fig. 8 represents a section on line so as, Fig. 2. Fig. 9 represents a section on line x at, Fig. 2.

In the drawings, a represents the abrasive belt, which may be of paper, cloth, or other suitable material, coated with sand or emery, or otherwise provided with an abrasive or polishing surface.

I; 0 represent the supporting-pulleys on i which the belt runs, the pulley b being affixed to a shaft, 2, to which power is applied to drive the belt. The pulley c is j ournalcd in bearings formed in the swinging end of a frame,

d, which is pivoted or bring upon a fixed stud,

6, located between the pulleys b c.

' f represents the intermediate support, which, as described in my above-named Letters Patent is composed of a rigid back, 2, and a coating, 3, of felt or other suitable compressible-material, arranged to support the belt at a point between the two pulleys. attached to the pivotedframe (Z by any suit-able means, as by set-screws g 9. 'When the pulley c is in its normal position, a line drawn from its center to the center of the pulley Z will be at one side of the axis on which the frame (1 swings. Consequently when said frame is turned in one direction on its axis or pivot, the distance between the pulleys is increased, and the belt is therefore tightened; but when the frame is turned in the opposite direction the belt is loosened.

The arrangement of the parts described is such that the pressure exerted against the intermediate support, f, will produce the described belt-tightening movement of the frame d,while the removal of said pressure will cause The support f is the belt-loosening movement, the latter being automatic. It will be seen, therefore, that the belt is under tension only when in actual use, and is automatically relieved from any injurious strain by the withdrawal of the article on which it acted.

The belt-tightening movement of the frame is limited by an adjustable stop composed in the present instance of a screw, 71, working in a tapped lug, i, affixed to the supporting-frame m, and an arm, 3', mounted on the stud 0, so as to move with the frame (2, as hereinafter described, and having a lug, 70, which comes in contact with the screw h when the frame d is sufficiently moved by pressure against the intermediate support. Breakage or injury to the belt by extreme pressure against the support is thus prevented.

The point at which the belt-tightening move ment isarrested may be varied by adjusting the screw 71. A lug, Z, affixed to the frame inunder the lug 1', supports said arm and the frame (Z when pressure is removed from the intermediate support. The arm j is pivoted independently of the frame (I, and is engaged with said frame by means of a crank-pin or eccentric stud, a, secured to a transverse rod,

0, journaled in the frame d. .The pin or stud'l 6 and 7.

n projects into a longitudinal groove formed in the arm j.

The normal position of the pulley c-viz., the position it assumes when the belt is not in operation and the arm j is resting on the lower lug or support, Z-is determined by the position of the crank-pin a. Vhen said pin is depressed, as shown in Figs. 1, 3, and 9, the pulley c is at its highest normalposition, so that only a slight additional elevation is required to enable it to tighten the belt; but when the rod is turned to raise said crank-pin, the frame (1 is allowed to swing downwardly, and thus loosen the belt, so that it can be readily removed from its supporting-pulleys. The rod 0 is provided with an operating-handle, whereby it may be turned to raise or lower the frame cl.

q represents a spring, which is adapted to depress" the swinging end of the frame (I when pressure is removed from the intermediate support, and thus quickly loosen the belt.

Said spring is'in the present instance secured to a collar, 1-, rigidly attached to the stud e,

on which the frame (I is hung, and presses downwardly at it other end against a crossbar on the frame (I.

The arbor of the pulley c has its bearings in a yoke, 4, which is swiveled at 5 to the frame d, and is capable of being turned to give the axis of the pulley c any desired longitudinal inclination for the purpose of centering the belt on the pulley. As a means for thus turning the yoke 4 and holding it in any position to which it may be turned, I employ a screw, 8, working in a tapped lug, t, on the yoke, and having a eonicalend which projects into a reces's, r, in a boss, 0, on the frame (I, and is normally held by a spring, a, hereinafter described, against an inclinedside of said recess, as shown in Fig. 8. hen the screw is advanced into the recess, its pressure against the side thereof will cause it to turn the yoke 4 against the pressure of the spring a in one direction, and when the screw is drawn outwardly the spring will turn the yoke in the opposite direction and cause the screw to follow the incline of the recess. The spring a is interposed between the frame (2 and a lug, u, on the yoke 4. The pulley c is formed with a longitudinally-convexor crowning pe riphery, as shown in Fig. 2.

The intermediate support, f,is extended forward under the pulley c, as shown, and its upper end has a convex or crowning form in cross-section,correspondingto thelongitudinal convexity of the pulley c, as shown in Figs. 2 and 4, and has an abrupt convex or salient curve in longitudinal section, which abruptly deflects the belt after it leaves the pulley c, as shown in Figs. 1 and 3. The remaining portion of the surface of the support is substantially straight in its longitudinal section, and presents cross-sections which are successively straight, as shown in Fig. 5, and concave with gradually-increasing depths, as shown in Figs.

In other words, the belt-supporting surface of the support gives the belt at the forward end a form such as would be imparted by a small crowning pulley, and at the line 2 z a straight or flat form in cross-section, the remaining portion retreating somewhat from the belt, as shown in Fig. 3, and giving it a concave form when it is pressed against the support by the article acted upon by the belt. This form of support is particularly adapted for abrading or buffing the bottoms of boot and shoe soles. The concavo-convex format yy adapts the belt to act on small depressions or irregularities in the surface, which could not be reached by a portion of the belt which is flat or approximately flat. The flat portion at z z adapts the belt to flat portions of the sole,

if any, while the varying concave portion" adapts-the belt to the varying convexities of the sole, or to soles of different sizes and styles.

The abrupt curvature or deflection of the belt at y y enables it to act on the bottom of the shank portion of a boot or shoe bottom to a point in close proximity to the breast of the heel. The support may be formed to give the belt a still more abrupt deflection, as shown:

in Fig. 3.

It will be seen that the crowning form of the pulley c, besides keeping the belt central,also causes it to prepare or form-the belt for the abruptly-curved end of the support, so that the belt will conform closely to said abruptlycurved end.

The various details of construction shown and described herein may be variously modified without departing from the spirit of my invention.

One end of the arb'or d, which supports and rotates the pulley b, is supported in a bearing formed in an arm, a, rigidly attached to the stud c, on which the frame d is hung. Said arm is provided with a circular enlargement, a", which serves as a guide to the operatorin applying the belt to the pulley I). Said enlargement is smaller than the pulley and gives the belt laid upon it an approximation of the form which the belt receives by its application to the pulley Z), the operator being enabled to pass the belt easily from the enlargement to the pulley, the enlargement serving to support the operators hand while he is applying the belt to the pulley.

I do not limit myself to the employment of the intermediate support in all cases. The

pulley 0, supported as shown, may have a surof an abrasive belt, two supporting-pulleys therefor, an intermediate support for said belt, and mechanism whereby the belt is tightened by pressure exerted on the belt and its intermediate support, and automatically loosened when said pressure is removed, as set forth.

2. In an abradingmaohine, the combination 5 of an abrasive belt, two supporting-pulleys therefor, a pivoted frame, whereby one of said pulleys is supported and adapted to be moved with relation to the other pulley, so as to either tighten or loosen the belt, and anintermediate support for the belt, connected to said pivoted frame, whereby,when pressure is exerted against the belt and its support, the belt is tightened, and when said pressure is removed the belt is automatically loosened, as I 5 set forth.

3. In an abrading-machine, the combination of an abrasive belt, two supporting-pulleys therefor, a pivoted frame supporting one of said pulleys, an intermediate support for the belt, connected to the pivoted frame, and a stop to limit the belt-tightening movement of said frame, as set forth.

4, In an abrading-machine, the combination of an abrasive belt, two supporting-pulleys therefor, a pivoted frame supporting one of said pulleys, an intermediate support for the belt, connected to the pivoted frame, and a spring whereby the swinging end of the frame is automatically moved to loosen the belt, as 3o set forth.

5. In an abrading-machine, the combination of an abrasive belt, two supporting-pulleys therefor, a pivoted frame supporting one of said pulleys, an intermediate support for the belt, connected to said frame, and means, substantially as described, for varying the normal position of the pivoted frame and the pulley supported thereby, as set forth.

6. In an abrading-ma-chine, the combination c of an abrasive belt, two supporting-pulleys therefor, a pivoted yoke supporting the journals of one of said pulleys, and adapted to be turned so as to give the axis of the pulley any desired longitudinal inclination, and means, substantially as described, for turning said yoke and for holding it at any position to which it may be turned, as set forth.

7. In an abrading-machine, the combination of an abrasive belt, two supporting-pulleys therefor, one having a crowning periphery, and an intermediate support having a convert or crowning abruptly-curved surface at one end, arranged to curve the belt abruptly inits passage from one pulley to the other, as set forth.

8. In an abrading-machine, the combination of an abrasive belt, two supporting-pulleys therefor, one having a crowning periphery, and an intermediate support having a convex or crowning abruptly-curved surface arranged 60. to curve the belt abruptly in its passage from one pulley to the other, and thereafter presenting, successively, a straight surface and a concave surface of gradually-increasing depth, as set forth.

9. The combination, with the supporting and driving pulley b, of the bearing or support for the arbor of said pulley, providedwith the circular enlargement (d, as set forth.

10. In an abrading-machine, the combina- 710 tion of an abrasive belt, two supporting-pulleys therefor, and mechanism whereby the belt is tightened by pressure exerted thereon, and automatically loosened when said pressure is removed, asset forth.

In testimony whereof I have signed my name to this specification, inthe presence of two subscribing witnesses, this 6th day of March, 1884.

FREDERICK IV. OOY.

Witnesses:

O. F. BROWN, A. L. WHITE. 

